To request a refund from Google Play, please follow the below instructions:
1. Open a mobile browser (like Chrome).
2. At the top, enter play.google.com.
3. Tap "Menu" then "Account" and then "Purchase History".
4. On the order, select Request a refund or Report a problem and choose the option that describes your situation the best.
5. Complete the form and note that you would like a refund.
6. You will see a message saying "Thank you for sharing your concerns." You'll then get an email with your refund decision. You’ll usually get this within 15 minutes, but it can take up to 4 business days.
You can check more details on this guide. To check the status of your submitted refund request, visit this page.